Growing Allium: The Magic of Flowering Onions
Grace Rose Farm • Bulb Library
Architectural, pollinator-loved, and surprisingly easy—ornamental alliums bring bold structure and whimsy to the late-spring and early-summer garden.
Allium—commonly called flowering onions—are one of the most striking bulbs you can plant. Rising on tall, sturdy stems, their perfectly rounded flower heads float above borders like garden fireworks. They bridge the gap between spring bulbs and early summer perennials, adding form and movement when many gardens need it most.
Alliums are part of the onion family, but ornamental types are grown entirely for their flowers. While the foliage may have a faint onion scent when crushed, the blooms do not.
These are the showstoppers—tall stems topped with softball- to dinner-plate-sized spheres of purple, lavender, or white.
A versatile category with slightly smaller flower heads and excellent garden balance.
These smaller alliums spread gently over time and work beautifully in naturalistic plantings.
Known for unusual shapes—oval, teardrop, or layered blooms—these add whimsy and texture.
Alliums thrive in full sun. More sun equals stronger stems and better bloom.
Excellent drainage is essential. Bulbs dislike sitting in wet soil, especially in winter.
Plant bulbs in fall at a depth roughly three times the height of the bulb.
Water after planting, then let nature do the rest. Overwatering is more harmful than underwatering.
Bulbs generally need very little feeding. A light compost top-dress in fall or early spring is sufficient.
Space bulbs so mature flower heads don’t crowd—grouping is beautiful, but airflow still matters.
Allium foliage often yellows before or during bloom. Plant bulbs behind emerging perennials or low shrubs so fading leaves are visually tucked away.
Allium flowers last for weeks and continue to provide interest even after petals fade. The seed heads dry into beautiful sculptural forms that can be left standing or cut for arrangements.
Bees and butterflies adore allium flowers, while deer and rodents typically avoid them. This makes allium one of the easiest high-impact bulbs for mixed gardens.
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